Patents by Inventor Philip H. Kwan

Philip H. Kwan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Self-cleaning fluid injection system
    Patent number: 4090475
    Abstract: Apparatus for delivering different additive fluids in controlled amounts to equipment utilizing those fluids, such as laundry or dishwashing equipment, with the apparatus including valves for passing the different fluids to a pump unit, desirably actuated by individual timers controlled by separate product control switches, and with the apparatus acting to automatically feed flushing water past the discharge sides of the valves and through the pump after each operation of the equipment to clean the system of the additive fluids in preparation for a next successive operation.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: May 23, 1978
    Assignee: S. E. Rykoff & Co.
    Inventor: Philip H. Kwan